A rate is excessive if it is likely to produce a profit that is unreasonably high for the insurance provided or if expenses are unreasonably high in relation to the services rendered.
A rate is not inadequate unless such rate is clearly insufficient to sustain projected losses and expenses in the class of business to which it applies and the use of such rate has or, if continued, will have the effect of substantially lessening competition or the tendency to create monopoly in any market.
Unfair discrimination exists if, after allowing for practical limitations, price differentials fail to reflect equitably the differences in expected losses and expenses. A rate is not unfairly discriminatory because different premiums result for policyholders with like exposures but different expenses, or like expenses but different loss exposures, so long as the rate reflects the differences with reasonable accuracy.
215 ILCS 5/456